Unforgiven by Lauren Kate

It starts with a song – Lilith’s song – and a little help from Arrianne who tells him that Lilith ended up in hell. Cam goes out in search of Lucifer, but he doesn’t have to look far. Lucifer knows what he wants, so he shows Cam what he wants to see. But Cam isn’t satisfied with just a glimpse of her, especially because she is in Hell. So he makes a deal with the devil.